US

A woman (C) walks amongst US national flags erected by students and staff from Pepperdine University to honor the victims of the September 11, 2001 attacks in Malibu, California on September 9, 2014. The students placed some 3,000 flags in the ground in tribute to the nearly 3,000 victims lost in the attacks almost 13 years ago. AFP PHOTO / Mark RALSTONMARK RALSTON/AFP/Getty Images

Mark Ralston/AFP/Getty Images

A woman walks among some 3,000 US national flags erected by students and staff from Pepperdine University Malibu, to honor the victims of the September 11 2001 attacks

Horses walk through flood water behind a home in Moapa, Nev., Monday, Sept. 8, 2014. Flooding throughout the area damaged homes and roads. (AP Photo/John Locher)

John Locher/AP

Horses walk through flood water behind a home in Moapa, Nevada. Flooding throughout the area damaged homes and roads Read more

Earth seen from the International Space Station...epa04383191 A handout picture made available by NASA on 04 September 2014 shows a view of Earth taken by NASA astronaut Gregory Reid Wiseman of the US from the International Space Station (ISS) on space, 02 September 2014. The Expedition 40 crew has been busy on the ISS performing health checks and humanoid robot upgrades. A trio of orbital residents is packing up gear as they prepare to return home in less than two weeks. Commander Steve Swanson powered down and stowed Robonaut 2 after wrapping up its mobility upgrades this week. He installed new legs on the humanoid robot including external and internal gear as well as cables. This sets the stage for more upgrades in the fall before Robonaut takes its first steps as an assistant crew member. Robonaut was designed to enhance crew productivity and safety while also aiding people on Earth with physical disabilities.  EPA/NASA/REID WISEMAN  HANDOUT EDITORIAL USE ONLY

Reid Wiseman/Nasa/Epa

A view of earth taken by Nasa astronaut Gregory Reid Wiseman from the International Space Station, where the Expedition 40 crew have been performing health checks and humanoid robot upgrades Read more

Protests over Michael Brown shooting...epaselect epa04363300 National Guard watch from a small hill top a couple blocks away as demonstrators protest the shooting death of Michael Brown in Ferguson, Missouri, USA, 21 August 2014. The National Guard is to withdraw from Ferguson, Missouri as nearly two weeks of often violent protests have finally waned. Only six arrests were logged overnight in the town, which saw a more peaceful night after steady protests related to the killing of an unarmed black teenager by a policeman.  EPA/LARRY W. SMITH

Larry W. Smith/EPA

Members of the National Guard watch from a small hilltop two blocks away from protesters in Ferguson, Missouri Read more

Protests over Michael Brown shooting...epa04363296 Demonstrators protest the shooting death of Michael Brown in Ferguson, Missouri, USA, 21 August 2014. The National Guard is to withdraw from Ferguson, Missouri as nearly two weeks of often violent protests have finally waned. Only six arrests were logged overnight in the town, which saw a more peaceful night after steady protests related to the killing of an unarmed black teenager by a policeman.  EPA/LARRY W. SMITH

Larry W.Smith/EPA

Demonstrators protest the shooting of Michael Brown in Ferguson, Missouri, as the National Guard announces its withdrawal from the town as calm descends following two weeks of often violent clashes Read more

Protesters stand in the street as lightning flashes in the night sky in Ferguson, Mo. on Wednesday, Aug. 20, 2014. A grand jury has begun hearing evidence as it weighs possible charges against the Ferguson police officer who fatally shot 18-year-old Michael Brown. (AP Photo/Jeff Roberson)

Jeff Roberson/AP

Lightning flashes over protesters on the streets of Ferguson, Missouri. A grand jury has begun hearing evidence as it weighs possible charges against the Ferguson police officer who fatally shot 18-year-old Michael Brown. Read more

HMS Plymouth to be scrapped...A statue from Another Place by Anthony Gormley is seen in the foreground as HMS Plymouth is towed away from Liverpool to be scrapped. The warship was part of the mission during the Falklands war and is on its way to Turkey where it will be scrapped.  PRESS ASSOCIATION Photo. Picture date: Wednesday August 20, 2014. See PA story DEFENCE Plymouth. Photo credit should read: Peter Byrne/PA Wire

Peter Byrne/PA

A statue from Another Place by Anthony Gormley is seen in the foreground as HMS Plymouth is towed away from Liverpool to be scrapped. The warship was part of the mission during the Falklands war and is on its way to Turkey where it will be scrapped. Read more

South Korean special police officers descend the stairs from subway station during an anti-terror exercise as part of Ulchi Freedom Guardian or UFG in Seoul, South Korea.

Lee Jin-man/AP

South Korean special police officers enter a subway station in Seoul, South Korea, during an anti-terror exercise as part of Ulchi Freedom Guardian, an annual joint military operation between South Korea and the US

Police officers point their weapons at demonstrators protesting against the shooting death of Michael Brown in Ferguson, Missouri...Police officers point their weapons at demonstrators protesting against the shooting death of Michael Brown in Ferguson, Missouri August 18, 2014. Police fired tear gas and stun grenades at protesters on Monday after days of unrest sparked by the fatal shooting of unarmed black teenager Michael Brown by a white policeman. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW CIVIL UNREST)

Joshua Lott/Reuters

Police fired tear gas and stun grenades at protesters on Monday in Ferguson, Missouri, after days of unrest sparked by the fatal shooting of unarmed black teenager Michael Brown by a white policeman Read more

Police officers point their weapons at demonstrators protesting against the shooting death of Michael Brown in Ferguson, Missouri...Police officers point their weapons at demonstrators protesting against the shooting death of Michael Brown in Ferguson, Missouri August 18, 2014. Police fired tear gas and stun grenades at protesters on Monday after days of unrest sparked by the fatal shooting of unarmed black teenager Michael Brown by a white policeman. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW CIVIL UNREST)

Joshua Lott/Reuters

Police officers aim their weapons at demonstrators, having fired tear gas and stun grenades at protesters in Ferguson, Missouri. Read more